netdev - Re: Using net_devices with ATM/DSL

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Message-Id: <201012131350.10206.florian@openwrt.org>
Date:	Mon, 13 Dec 2010 13:50:09 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Philip Prindeville <philipp_subx@...fish-solutions.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Using net_devices with ATM/DSL

Hello,

On Monday 13 December 2010 07:53:07 Philip Prindeville wrote:
> I was trying to get this discussion rolling on linux-atm-general but didn't
> have much luck.
> 
> I was wondering what the downside to having ATM/DSL interfaces use
> net_devices would be?

I think you would have to add ATM/DSL-specific extensions (ala wext) just to 
extend it, specializing an atm_dev would make more sense to me.

> 
> Part of the reason for wanting to do this is to have an end-point to
> send/receive netlink messages to, so that the interface can report carrier
> state transitions, bit rates, bit-error rates, SNR, attenuation,
> constellations, transmitter gain, etc.
> 
> Seems simple enough.

If you want to be able to report informations from the DSL PHY, I would rather 
specialize an interface called, say dsl_phy which has a list of operations for 
setting/getting the DSL PHY state, low-level counters ... 

The atm stack more or less already supports an ATM PHY with 
atmphy_ops, but is in my opinion too limited to query chip-speficic infos.

Once that interface is well defined, adding netlink support to it should be 
rather straight forward.

> 
> Why not do this?
> 
> Thanks,
> 
> -Philip
> 
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